Troubleshooting/Service
Procedure #3
Table 7-7 explains how to troubleshoot Position Proportional Output failure symptoms.
Table 7-7 Troubleshooting Position Proportional Output Failure
Step What to do How to do it
1
Make certain that the controller
is configured for Position
Proportional output.
Make Output Algorithm Set Up group function
prompt OUT ALG = POSITON.
Refer to Section 3 - Configuration.
2
Check the field wiring. Refer to Section 2 - Installation for details.
3
Check the output. Put the controller into Manual mode and
change the output from 0 % to 100 %.
4
Check whether the motor
drives in both directions. If it
does go to Step 6.
See the Position Proportional calibration
procedure in Section 6 - Output Calibration for
motor slidewire calibration.
5
Check whether the motor
drives in either direction. If the
motor drives only in one
direction, check the slidewire. If
the motor does not drive in
either direction, check the
motor.
Refer to the motor instructions.
6
Check the output voltage to the
slidewire (if used).
See the Input 2 wiring diagram for terminal
designations in Section 2 – Installation.
1) Measure between the R and the – terminals
(across the entire slidewire). This voltage
should be between 0.024 volts (for a 100 ohm
slidewire) and 0.200 volts (for a 1000 ohm
slidewire). This voltage should remain steady
as the motor moves.
2) Measure between the + and the – terminals
(across just the wiper section). This voltage
should be somewhere between 0.002 and
0.200 volts, depending upon the total slidewire
resistance and the current position of the
slidewire. This voltage should vary smoothly
as the motor moves and the wiper travels
across the slidewire. If the voltage jumps at a
particular position while the motor is moving,
this could indicate a “deadspot” and mean that
the slidewire may be worn out and need
replacing. Refer to the motor manufacturer’s
instructions.
162 UDC3200 Universal Digital Controller Product Manual 12/04
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